Home / 81,009.60-121,514.40-76,416.90

Finding the Fourth Proportional to 81,009.60, 121,514.40 and 76,416.90

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Solution

The fourth proportional to 81,009.60, 121,514.40 and 76,416.90 is: 114,625.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,009.60 : 121,514.40 = 76,416.90 : x
  2. Step 2: Convert to fraction form
    81,009.60/121,514.40 = 76,416.90/x
  3. Step 3: Cross multiply
    81,009.60x = 121,514.40 × 76,416.90
  4. Step 4: Simplify right side
    81,009.60x = 9,285,753,753.36
  5. Step 5: Solve for x
    x = 9,285,753,753.36/81,009.60
  6. Step 6: Final answer
    x = 114,625.35

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.